okay, d'oh. Didn't see a compiler error.

.gitlab-ci.yml

 image: maven:latest
 
 variables:
-  MAVEN_CLI_OPTS: "-X -s maven/settings.xml --batch-mode"
+  MAVEN_CLI_OPTS: "-s maven/settings.xml --batch-mode"
 
 cache:
   paths:

bwreg-webapp/src/main/java/edu/kit/scc/webreg/bean/admin/bulk/BulkUserImportBean.java

@@ -131,7 +131,7 @@ public class BulkUserImportBean implements Serializable {
 				try {
 					Map<String, List<Object>> attributeMap = new HashMap<String, List<Object>>();
 					userEntity = userCreateService.preCreateUser(idpEntity, spEntity, 
-							new SamlIdentifier(importUser.getPersistentId(), null, null, null), null, attributeMap);
+							new SamlIdentifier(importUser.getPersistentId(), null, null, null, new HashMap<String, String>()), null, attributeMap);
 
 					Response samlResponse = attrQueryHelper.query(userEntity, idpEntity, idpEntityDescriptor, spEntity);